US2620057A - Tabulating mechanism for typewriters or like machines - Google Patents

Description

W. H. KUPPER Dwz, 1952 TABULATING MECHANISM FOR TYPEWRITERS OR LIKE MACHINES 4 Sheets-Sheei l filed Aug. 2l, 1950 MACHINES W. H. KUPPER Dec. 2, 1952 TABULATING MECHANISM FOR TYPEWRITERS OR LIKE 4 Sheets-Sheet 2 Filed Aug. 2l, 1950 lNVENToR w/LL//IM h: frz/#PER M ,A4 ATTORNEYS Dec. 2, 1952 w. H. KUPPER TABULATING MECHANISM FOR TYPEWRITERS OR LIKE MACHINES Filed Aug. 21, 1950 4 Sheets-Shee.

' ATTORNEYS Dec. 2, 1952 w. H. KUPPER 2,620,057

TABULATING MECHANISM FOR 'ILYPEWRITERS OR LIKE MACHINES Filed Aug. 2l, 1950 4 Sheets-Sheet 4 Fig. 7. Fig. 6.

BY 6MM ww f ATTORNEY S Patented Dec. 2, 1952 UNITED STATES PATENT ove-Fic Ei TABULATING MECHANISML FIOR TYPE WRITERS OR`- LIKE MACHINES William H. Klippen West Hartford`; Conn.,A assignor'to Royal Typewriter Company, Inca, N ew` York, N. Y., a corporation of New York ApplcationlAugust 21,1950, SerialNo. 180579a 12v Claims;` (Cl. 19'7---176--)` This invention `relates to tabulating mechanism.'`

for typewriters or like machines; andA more particularly to improvements in` the construction. and arrangement of such mechanismsand related parts bylwhich a completetabulating operation can be effected `bymomentarily depressingakey or operating an` actuating element J withoutits.

to position a main. frame mounted .stop inthe path offar tabular stop on the carriage,` it usually being necessaryforthe key to be held'depressed until after the carriage has .completed its run and has been stopped by engagement of the carriage mounted stop with. the frame` mounted stop. It previously has been proposed to provide a detent or holdingdevice for maintaining the tabulating mechanism parts in operative positions after having beenset, so as to render it unnecessary to hold the key` depressed throughout thelwhole tabulating operation. In accordance with the `present invention, improved means; is provided for holding the tabulating and associated parts inset or operative position after only a momentary operation ofa key.

Anl` object of the invention is to provide such a holding means which is of strong and rugged construction. and capable of giving long and accurate service under the repeated shocks and strains imposed on the mechanism incident to stopping the carriage abruptly at the end of relatively long runs, when the. carriagehas attained considerable momentum.

Another object of the invention is toprovideY a mechanismy of the character referred to which, although adapted for use in machines ofdifferent basic designs, is especially adapted for use to greatest advantage in power driven machines` suchas electric typewriters.

Another object of the invention is to provide a mechanism ofv the kind referred to includinga novel device for preventing rebounding of the carriage' after it has been stopped at the end of a tabulating run.

A further object of the invention is to provide a novel' construction and arrangement of tabulating stop mechanism, tabulating brake` mechanism, and escapement disabling` mechanism, interconnected for operation in properly timed relation.

Other objects of the invention will become apparent from a reading of. the following descrip, tion, the appended claims, and the accompanying drawings, in` which:

Figure l is a vertical, fore and aft, cross sectional view of a typewriter embodying the invention, certain parts being shown in eleva-tion and some conventional.i typewriter parts Abeing omitted,l

the .illustratedV partsof` a. tabulating4 mechanism being shown in. `theirinactive positions Figure 2 `is a.fragmentary-` vertical.: sectional` views of?A key-operated mechanism `for` effecting tabul'ating` operations,v some `parts being shownin elevation;`

Figure 3 is` a. view drawn` on, an` enlarged4 .scalev with some parts` shown in` vertical` section substantiallyl'on the lineair- 3 -of Figure 1 andothers in elevation,` thetparts being. shown inftheir. inactive positions;

Figure 4` is a view: similar. to Figure 3' with` certain. parts omitted. the l parts illustrated being shown in their active or operative positions;

Figure 5 isanlenlargedview, partly in elevation and?partlyinioreand aft vertical section; showing tabulating. mechanism", a tabulatingL brake, and parts-for` operating thetabulating andibrake. mechanism;

Figure 6 is :a` fragmentary top plan` view. ofrstop` parts of' the tabulating. mechanism shownintheir i normal' or inactive positions;

Figure '7 is a view similar to Figurebutshowing. certain frame-mounted tabulating.` mecha.-4 nism` parts inz their operativepositions, 4and show:- ing` tabulatingl parts mounted. on. the typewriter carriage approaching the frame-mounted parts'` prior to arresting of, the carriage in thetabulated position;I

Figure 8 is aview. similar to Figure 7 butfshowing, th'eparts in the positions they occupy when the carriages has` been arrested at the end' ot a tabulating movement? Figure9 is.. a. detailed View; partly in elevation andpartly in fore: and aftvertical section, showing.: connections for operating the tabulating,

'brake and frame-mounted tabulating parts;

Figure lily is a View similar to Figure "8A but drawnzona still `further enlarged scale; and,

Figure. 131.. is a detailed view, partly in elevation and part-ly insection longitudinally from end ,to

end orthe maohinashowing a center stop and.

cooperating marginstop mechanism.

The. typewritingmechanism shownby way of example as embodying the invention in a preferredi form. is generallysimilar in many respects tothe Royal standard oiiice typewriter andV the Royal `electric typewriter. It includes a` main frame element A provided with a lower track or rail l on' which a carriage element B including end platesl 2 and (i` isinounted for letter spacing and returnmovements by means of a carriage or toprail: liland-ball-rollers,` one of Whichis shown ati inFigure 1. The carriage B is equipped with the usual. cylinder or platen C.

. Mounted on the main frame for vertical shifting movements is a segment 6 Which supports a full complement of type bars, one of which is shown at l pivoted as at 8- on the segment. The type-barsmay be operated by links, one of which is indicated at Shwhich-may beconnected toany suitable key operated or key controlled mechanism. Shifting of the segment for changing the case of typing may be effected by a link I pivoted at its upper end to the segment 6 and connected to suitable actuating mechanism, for example, mechanism of the kind disclosed in the copending application of William H. Kupper, Serial No. 133,322, filed December 16, 1949, now United States Patent No- 2,590,777, issued March 25, 1952.

The carriage B is urged to the left, that is, in the letter spacing or typing spacing direction, by suitable means such as a conventional spring drum (not shown) which exerts a steady pull on a draw band connected by a clip II to an ear I2 on the right hand carriage end plate 2. Movement of the carriage to the left under the urge of the spring drum or other driving mechanism is controlled by escapement mechanism illustrated partially as including a rack I3 carried by an angle bar or rail Id having rearwardly extending arms I5 pivotally mounted on the carriage at I5. Springs I?, connected to rearwardly extending portions of the arms I5 and anchored at I8 on the carriage, normally hold the escapement rack I3 in the position shown in Figure l, in which the rack meshes with an escapement pinion I9 journalled on a shaft carried by a framemounted bracket 26E. The pinion I9 is fast with an escapement wheel 2l adapted to rotate about the shaft 2t and to cooperate with escapement pawls or dogs (not shown) which may be of the kind and operated in the manner disclosed, for example, in the copending application of Henry J. Hart, Serial No. 98,738, filed June 13, 1949, now United States Patent No. 2,563,722 granted August'7, 1951.

In operation, when the escapement dog mechanism is actuated, the wheel 2l is permitted to turn in step-by-step increments so as to permit the rack I3 and, consequently, the carriage to be fed to the left in the direction of typing.

In order to limit the travel of the carriage to the left for maintaining a right hand margin onthe work sheet, a margin determining center stop; 22 is pivotally mounted on the frame as at 23. The center stop 22 carries a line lock lever 213 pivoted on the center stop as at 25 and having its upper end formed as a blade or finger 2t disposed in the path of a margin stop 27 mounted for adjustable positioning on a vmargin stop bar 28 supported on the carriage B. The lower end 29 of the line lock lever 2d is bent or otherwise extended rearwardly as at 29 or to the right in Figure 1, and is connected to a link shown partially at 30 in Figures l, 3 and 4, which leads to parts (not shown) for locking the typing keys or otherwise preventing type bar operation when the carriage has reached a predetermined point in its travel in the letter spacing direction. A margin release key with associated mechanism (not shown) is connected by a part Si to a push rod 32having its forward end in contact with the rear face of a downwardly extending plate 33 secured to the center stop 22, as shown in Figure 1.

In operation, when the carriage B moves to the left to a position just short of its maximum left- Ward travel position, the margin stop 2l engages the blade 26 of the line lock lever 25 so as to rock the lever and push the blade 26 against the upper part of the center stop 22, thereby bringing the carriage to rest and also operating the line lock link '39 through the rocking of the line lock lever 24. If it is desired to feed the carriage a few more spaces toward the left for completing a word or syllable, the margin release key is operated to move the part 3l and push rod 32 forwardly so as to rock the center stop 22 clockwise about its pivot 23, as shown in Figure 1, to move the upper end of the center stop 22 and the line lock blade 26 rearwardly of the margin stop 27. A limit :abutment screw 27e mounted on the right hand carriage end plate 2 is adapted to engage the line lock blade 25, even when the latter is in its margin release position, so as finally to limit the carriage travel to the left.

In accordance with the invention, a tabulating brake, which may be of known form, is cooperatively associated with tabulating mechanism for raising the carriage rack I3 to permit movement of the carriage in the typing spacing direction free of restraint by the escapement mechanism and bringing the carriage to rest at a desired tabular position, the brake serving to prevent the carriage from attaining too high a tabulating speed when long tabulating movements are per- 4 formed. In the form shown, disabling of the escapement mechanism for effecting tabulating movements of the carriage is accomplished by rocking of a rack bar lifting arm generally designated 361 pivoted as at 35 on the frame and having an upper arm 35 extending under the rack rail HI. The lower end of the lifting lever 34 is formed with an ear 31 (Figures 1, 5 and 9) adapted to be pushed forwardly so as to rock the lever 3d clockwise as viewed in Figures 1 and 5 in a manner to be described later.

When the rack I3 is lifted and disengaged from the escapement pinion I?! by rocking of the lifting lever 34, the brake, `which normally is ineffective for retarding the carriage, is brought into operation. The brake mechanism, as shown most clearly in Figure 5, includes a mounting arm 38 pivoted on .the lifting lever 35i at 39 so as to have a slight movement relative to the lifting lever, limited by coaction of an opening 46 in the arm 33 and :a headed pin il on lthe lifting lever 34. Normally, when the brake is inoperative, the parts will be so positioned that the pin lll will be in engagement with the bottom of the opening d, the arm 38 being held yielolably in this position by a spring I2 interposed between the upper arm 3d of the lifting lever 34 and an ear 38a on the arm 3S. In other respects, the brake mechanism is similar to the brake mechanism disclosed in the patent to Henry J. Hart No. 2,182,433, granted December 5, 1939. The mechanism includes a pinion ft2 formed with `a projection IIS adapted to engage a companion projection i4 on `a brake drum L35, both the pinion 52' yand the drum @l5 being journalled on a stub shaft d5 carried bythe brake arm 33. A spring dl coiled around the shaft @f6 normally maintains the projections 53 and M in the relative positions shown in Figure. A brake lever 48 is pivoted at 139 on the arm 38, and is formed with a shoe 5t urged into frictional engagement with the brake drum :i5 by means of a spring 5I interposed between a lower extension 331 of the arm 33 and the brake lever itself.

In operation, when the lifting lever 34 is rocked from its normal or Figure 1 position to the position shown in Figure 5, the rack I3 is moved out of engagement with the escapement pinion I9 so as to free the carriage for movement .to the left unrestrained by the escapement mechanism, and, concomitantly, the arm 38 is rocked so as to bring the brake pinion ft2 into mesh with the carriage rack I3. During the first part of the carriage tabulating movement to the left, the

acaogosv pinion 42 will rotate substantially freely with respect to the brake drumli, being restrainedonly inconsequentially by the tensioningV of the light spring el. During this initial rotation of .the pinion,the projection ll3` will be moving circumferentially away from the brake drum projection M. When the pinion projection 43 engagesthe other side of the drum projection 44', that isthe lower faceof the projection 44 as viewed inFigure 5, continued rotation ofthe pinion can` take place only `with simultaneous rotation of the brake drum ddwhich. is retarded frictionally by the pressure of the brake shoe 55. In this way, and as explained in more detail in the Hart Patent No. 2,182,433reierred to above, short tabulating movements of the carriage may be made without undue retarding` of lthe carriage by the brake, whereas, if long tabulating movements are to be made, the carriage will start relatively quickly, but later will be retarded by the brake drum t5, rotation of which is resisted frictionally by the brake shoe 5B,

Many of the parts described above are of known construction and: relative arrangement. The invention relates more particularly to other partsto be described hereinafter, and to the yarrangement of such other parts with parts already described.

The tabulating mechanism includes a support shown inFigure 5 and being generally designated 52 mounted on the carriage and comprising upper and lower rack bars 53 and 54 respectively formed with transverse grooves 55, 55` which register with each other and whichWare spaced longitudinally of the rack bars at letter space intervals.

Mounted on the stop frame or support 52 is a plurality of laterally settable stop devices, several of which are designated D `and are shown in their normally inoperative positions, `and others of which D 'are shown in their rearwardly projected or operative positions. The tabularstops D-D are similar to individual stops disclosed in the patent to Myers et al. No. 1,892,071. Each includes a bridge or central portion 5l, upper legs 53 and 59; which project alongside opposite sides of the upper rack bar 53, and lower lugs `E and I which project downwardly alongside opposite sides of the bottom rack bar Sii. IEach tabular stop part is provided `with la spring 62 mounted on a pin 53, with one end hooked at 64 around the edge of the tabular stop just above the lug G, the other end of the spring being curved as -at65 so as to press against the top rack bar 53. The arrangement is such that each tabular stop can be shifted transversely of the frame `52 to operative position at D' in Figure 5 or to an inoperative position shown at D in Figure 5, the spring E2 frictionally and yieldably maintaining the stop in whichever position it has been set.

When a tabular stop is seg in its operative position as shown at D in Figure 5, its rear edge projects toward the back of the machine sufficiently to be engaged by a frame mounted stop device adapted controllably to be moved into or out ofthe path of the operatively positioned stop D. In the illustrative embodiment of the invention, the frame mounted stop device is of such construction that when it has been moved to operative position it will be set or latched in such position automatically to remain there until a tabulating operation has been completed, without its being necessary for a key or other mechanism which moved the device to operative position to -be held depressed or otherwise actuated.

Thus the arrangement is such that a momentary operation of a tabular key or mechanism controlled thereby will set the frame mounted' stop device in its operative position where it will` remain until the tabulating operation has been completed even though the tabular key or mechanism controlled thereby is returned to its inactive or normal position before the tabulating operation has been completed.

In the form shown, the frame mounted stop device includes a tabulating lever 55 pivotally mounted at 67 on the bracket 23et so as to be rockable about an axis parallel to the direction of carriage travel. The tabulating lever @e is urged clockwise as viewed in Figures 1` and 5 by a spring 68 interposed between a pin` 69 fixed to the lever t5 and a bracket It secured to the bracket 23a. Movement of the lever G5 by the normalizing spring 53 is limited by engagement of the rear edge of the upper part of the lever with a stop ear 'H depending from a bracket 'E2 secured to the bracket 23a, the stop ear 'lll determining the normal or retracted position ofthe tabulating lever (it.

A` flipper or blade I3 is pivotally mounted at M on the tabulating lever d@ so as to be'rockable about an axis perpendicular to the direction ofV carriage travel. The blade 73 is guided in its rocking movement by a pin 15 fixed to the lever 56 and extending through a slot 'it in the blade 'EL'. The blade is urged to rock clockwise as viewed in Figures 3 and 4 by a spring 'H interposed between a pin 'i8 fixed to the blade and the bracket l2. Normally, the spring Il causes the blade 13 to press against the shank" portion 'F9 of a Vlatching part formed as a pingenerally designated fill. mounted on the bracket i2 as shown rin Figures 1, 3 and 6. The latching part Sil has a threaded part 8| which extends through a hole 82' in the bracket l2. with considerable radial clearance so as tolenable the pin to be positioned-adjustably and to be held in adjusted position by clamping nuts 83.

In the normal positions of the parts as shownl in Figures 1, 3i and 6 the ipper blade 'i3 is in a' retracted position, rearwardly cutoff the path of a projected tabular stop D on the carriage` so that the projected stop D can pass the flipper I3 without engaging it to stop thev carriage; Mechanism to be described later is provided.' for rocking the tabular lever 66 counterclockwise as viewed in Figures-1, 5 and 9 to move the blade or flipper 13 into the path of projected tabular stops D', the counterclockwise rocking of the lever 66 being` limited by engagement of an ear 8f3 on the lever 65 with the back of the bracket 23a;

When the tabular lever et, is rocked counterclockwise from its retracted position shown` in Figure 1 to its operative position shown in Figure 5, the side of the flipper blade T3 to be approachedby thecarriage mounted stop D moves beyond thel surface of the shank portion l of the pin 'so to be disposed opposite the surface of a reduced end portion S5 on thepin 8B, thereby enabling the spring 'il to swing the flipper in front of a shoulder 86 connecting the pin portions 19 and 85; Engagement of the iiipper` blade 'lil with the shoulder 85 will latch or retainv the entire frame mounted tabular stop device, including the lever E56 and blade I3, in its operative position with the blade 'I3 in the path of a tabular` stop D' on the carriage. The latching of the frame mounted stop device in its operative position will be maintained against the returning urge of the spring 68 even though only a momentary operating impulse has been imposed on the lever 60 to move it to the operative position shown in Figure 5.

When the carriage moves in the letter spacing direction to perform a tabulating run, after disabling of the escapement mechanism, it will travel freely except as restrained by the tabulating brake, previously described, until the carriage reaches the predetermined tabular position and the operatively positioned stop D engages the operatively positioned flipper blade 'I3 and moves it against the upper end of the tabulating lever S. The parts will then be in the relative positions shown in Figure 8 so that the carriage will be arrested with the stop D pressing to the left on the blade 13, and the latter pressing to the left against the upper end of the tabulating lever 09 which cannot move to the left because of its being supported by an upstanding part of the bracket 23a. Movement of the blade 13 against the upper end of lever 09 will also displace the rear edge of the blade from the shoulder 86 on the pin 80, enabling the spring 68 to rock the lever 00 and the blade 13 clockwise from the position shown in Figure to the normal or retracted position shown in Figure l. This will discontinue the blocking action of the blade 13 on the stop D', but before the carriage can move to the left the escapement mechanism will be re-enabled by lowering of the escapernent rack I3 into engagement with the escapement pinion I9, an operation which takes place simultaneously with movement of the blade 13 to its retracted position.

Mechanism is provided for preventing rebounding of the carriage toward the right when the carriage mounted stop D' strikes the bla-de 13, andthe latter strikes the tabular lever `66. In the form shown, a back check or rebound preventing pawl 81 is pivoted at 88 on a bracket 89 secured to the stationary bracket 'I2 by screws 90. The pivot 88 includes an eccentric bushing for variably positioning the axis of rocking of the pawl 81.I The pawl 81 is urged counterclockwise as viewed from above, that is as shown in Figures 6, 7, 8 and 10, `by a spring 9| interposed between an upstanding ear 92 on the pawl and a fixed ear 93 on the bracket 12. The position of the pawl is determined by engagement of a iinger 94 on the pawl with the pin 18 fixed to the ipper blade 13 as previously described. When the lever S9 and blade 'I3 are retracted so as to be in the position shown in Figure 6, the pin 18 on the flipper blade presses rearwardly against the linger 94 on the pawl 81 so as to hold the pawl in its retracted position as shown in Figure 6, With its nose disposed to the rear of the path of the tabular stop D on the carriage. The nose of the pawl 81 has cam faces 95 and 96 engageable with the stops D when the tabular lever 6B is projected or in operative position.

In operation, when the carriage moves t-o the left with a stop D' set in operative position and with the frame mounted stop device comprising the lever 06 and blad-e 19 being in projected position, the approaching stop D' will engage the pawl cam face 9E so as to rock the pawl 81 clockwise as viewed in Figure 6 to permit the stop D to pass beyond the pawl nose, after which the spring 9| will rock the pawl 81 counterclockwise to the position shown in Figure 8 with the cam face 95 of the pawl disposed adjacent a tapered edge part 91 on the stop D', thereby preventing rebounding of the carriage. As soon as the blade 'I3 has been moved oli the shoulder 86, th-e blade and the tabular lever 66 will .be returned to retracted position by the spring 68 in the manner previously described, causing the pin 1,8 on the blade topush rearwardly on the nger 94 of the pawl 81, thereby rocking the pawl clockwise from the position shown in Figure 8 to the position shown in Figure 6. The cam face on the rebound preventing pawl 81 and the tapered face 91 on the stop D are so related that the pawl 81 may be thus returned to its normal or inactive position without interference from the stop D which will have moved slightly to the left, although less than a letter space, when the control of the carriage was transferred from the tabular mechanism to the escapement mechanism.

I-f a tabular stop D', set in operative position, should be at the left of the tabulating lever 60 When the latter is in its projected position, and if the ,carriage should then be returned toward the right, the tapered surface 91 on the stop D will engage a tapered surface 13a on the flipper blade 13 so as to cam the stop D to its retracted or inactive position, that is the position represented by the stops D, thus permitting the carriage to return to its right hand position without being stopped by the tabulating mechanism and without damaging any of the parts.

Mechanism is provided for restoring the tabulating lever 66 to its retracted position if it should be in project-ed position when the margin stop 21 or the limit stop 21a engages the center stop mechanism to stop the carriage at the end of its letter spacing travel. In the form shown, and referring particularly to Figures 1, 3 and 4, a lever 98 is pivoted at 99 on the bracket 23a and has its lower end |00 disposed adjacent the rearwardly extending end 29 of the line-lock lever 24. The upper end of the lever 93 has a part |0| adjacent the flipper blade 13.

In operation, when the line-lock lever 24 is rocked either by the margin sto-p 21 or by the limiting stop Z'Ia as previously explained, the lower end part 29 of the line-lock lever presses against the lower end |00 ofthe lever 98 to rock the latter icounterclockwise from the position shown in Figure 4 to the position shown in Figure 3, causing the upper part |0| o-f the lever 98 to press against the blade 13 and move the latter oi the shoulder 86, thus enabling the spring 68 to return the lever 66 and blade 13 to their retracted positions.

Key-operated or controlled mechanism for corelatively disabling the escapement mechanism and moving the frame mounted tabular stop device 66-13 to projected position includes an operating member in the form of a pull link |02 arranged to transmit a momentary actuating effort through a cushioned drive transmitting connection generally designated |03. The connection |03 includes a three-armed lever |04 pivoted at |05 on a bracket |06 mounted by screws |01 on the rear wall |08 of the frame A. One arm |09 of the lever |04 is provided with a pivot stud ||0 which mounts for rocking movements a twoarmed lever The lever arm |09 also has a pin IIZ which extends through a hole ||3 in the two-armed lever with sufficient clearance to allow limited rocking of the lever I I with respect to the lever |09. A spring ||i4 interposed between the arm |09 of the lever |04 and an arm |-5 on the lever III urges the lever to rock clockwise with respect to the lever |04 so as normally to be maintained in the position shown in Figure 5 in which the bottom of the hol'e ||3 9 in the lever ||I engages the pin |i|2 on the lever |04.

Another arm il@ of the three-armed lever H34 is formed with a rounded nose Ill disposed immediately behind and being adapted to be pressed against the ear 3l previously referred to as being on the bottom oi the rack bar lifting lever 3ft. A third arm Iii? of the three-armed lever It is pivotally connected at IIS to the front end of a link generally designated |20, the rear end of which is pivotally connected at |2| to the lower end of the tabulating lever d6. The link I2@ includes longitudinally adjustable sections |2ila and |201), relative adjustment oi which is permitted by screw and slot connections indicated at- I22|23.

The rear end of the pull link |92 is pivotally connected at |24 to the upper arm of the twoarmed lever I l l.

In operation, and beginning with the parts innil their normal positions as shown in Figure l, and with the cushion connection |03 in the condition shown in Figure 5, a tabulating run of the carriage is initiated by a momentary movement of the pull link |592 toward the front of the ma-.

chine. This will tend to rock the lever I I about its pivot Iii) on the lever |63', but such rocking of the lever I I I is resisted by the spring I Ill. Consequently drive from the lever I I I is transmitted through the cushioning spring II to the three- 1; i

armed lever Iild, causing the latter to rock about its pivot m5, thereby causing the rounded nose I I'I to press on the ear 37 to rock the rack lifting arm 34 so as to disable the escapement mechanism. Rocking of the three-armed lever Idil willalso act through the link I2il to move the tabular lever |56 and flipper blade 'itl to their projected positions in which they will be latched by engagement of the blade 'i3 with the shoulder 85 on the pin til as previously explained. ing of the three-armed lever Iilll has been arrested by movement of the lifting lever Bil and the tabulating lever St to their limited positions the spring IIi will yield so as to enable the twoarmed lever I l to rock about its pivot ||Il under,Y

the driving impulse delivered by the pull linkAA E02, the parts of the cushioned drive transmitting connection Ill-3 then being in the relative positions shown inFigure 9. Consequently there will be no damaging of the parts due to stoppage of` end of a predetermined tabulating run without,

its being necessary for the tabular key to be held depressed or for the link lit. to be held in its actuated position.

The mechanism described above may be used to advantage with any suitable mechanism for` delivering actuating eiort to a main actuating or impulse transmitting part, e. g. the pull link M32. It can, however, be used to greatest advantage in connection with power operated actuating means,

and is illustrated as being operable by a preferred:`

form of power driven means, generally Idesignated E. This mechanism is generally similar to but embodies improvements in mechanism disclosed in the copending application of William Irl, Kupper, Serial No. 6,066, led February 3, 1948,.

When rock-1 now United States Patent No. 2,567,945, granted `September 18, 1951.

t includes a driving element, which operates continuously, and controllable driving connections, which normally are inoperative or ineffective, but which may be conditioned by the operator to effect operative driving connection between the continuously moving driving member and the pull link m2. 'The driver is constituted by a continuously rotating element, more particularly a toothed snatch roll or bar |25, which may be of known form, and which is adapted to be driven in the direction of the arrow fr in Figure 1 by any suitable means, but preferably by an electric motor (not shown).

The means for transmitting drive from the driver |25 to the link |62 includes an actuator `|26 which extends fore and aft of the typewriter and above the member |25. The actuator |26 is pivoted as at |21 to a lever |28 at a point off-set relatively to the pivotal mounting I2@ of the lever on a xed frame cross bar I 3&3. The actuator has a forwardly extending part |3| projecting under anabutment or guide plate |32 mounted by screws |33 on the frame A, to extend parallel to the snatch roll |25. A spring I iid, interposed between the front end of the actuator |26 and an anchor plate |35, yieldably urges the actuator to rock clockwise, and thus normally maintains the actuator in the position shown in Figures 1 and 2 with its front end part I-il bearing against the abutment or guide plate |32. Another abut- `ment I 3b is disposed below the abutment |32, and

ber |25, includes an interponent pawl or coupler i3?, pivoted as at |33 on the actuator. A spring its, anchored to the actuator |26 and connected `ment with the driving member |25.

to the pawl part I3?, biases or urges the latter to rock clockwise so as to move its nose |31@ into transient engagement with the snatch roll |25.

Normally, the pawl is maintained out of engagement with the snatch roll by the restraining action of a control element or trigger MID which is pivoted as at II on the actuator |26. In the normal position of the trigger, its rear end |42 engages a holding surface |43 on the pawl so as to prevent the spring |38 from rocking the pawl element |31 into drive-transmitting engage- The pawl itl is formed with an inclined resetter cam face lliil which is located just below the holding surface |43, and which is acted upon by the trigger for rocking the pawl counterclockwise, and thus resetting it in normal, inoperative position.

Operator controlled means is provided for bringing about operative driving connection between the driver |25 and the actuator |26. This means includes a manually operable tabular key M5 pivoted as at |46 on the frame A. Normally, the tabular key H515 is held in its upper position engaging a cushion stop Illl.

The tabular key |45 has an upward projection |63 disposed behind an arm |49 of an operating lever |59, pivoted as at ISI on a frame-mounted cross bar |52. The lever |58 has another arm |53 on which a limber dog or ilipper |54 is pivoted at |55. A spring |56 urges the limber dog |555 to rock clockwise to yieldably retain it in its normal position of rest against a limit stop |51. The dog |54 can swing counterclockwise from the position shown in Figures l and 2, but cannot move clockwise from this position. A returning spring |56, interposed between the tabular key |45 and a short arm |59 on the lever |50, yieldably holds the lever |50 and the tabular key |45 in their normal positions. In the normal positions of the parts, the lower end of the limber dog |54 overlies a contact ear |60 on the actuator |26.

In operation, when the tabular key |45 is depressed, the lever |50 is rocked clockwise to cause the ipper |54 to push the actuator |26 downwardly to an initial extent suflicient to bring the trigger |46 into engagement with the abutment |36. This causes the trigger to be rocked clockwise about its pivot |4|, so as torelease the pawl |31, which is then moved by the spring |39 into engagement with the snatch roll |25. The snatch roll then drives the pawl |31 and actuator |26 as a unit so as to rock the lever |28 and operate the link |02. When the pawl |31 is cast oi from engagement with the snatch roll |25, the spring |34 lifts the actuator` |26 to bring the trigger |40 into engagement with the upper, trigger-resetting abutment |32. This causes the trigger |40 to be rocked counterclockwise, so as to move its end |42 against the resetting cam face |44 of the pawl |31, thereby restoring the latter to its inactive position. The parts of the mechanism E will then be returned toward their normal positions by a. spring I6I interposed between a rearwardly extending arm |62 on the lever |26 and the lower part of a bracket |63 iixed to the frame cross bar |30, the tabular lever normalizing spring 68 assisting the spring I6I after unlatching of the stop device 66-13 at the end of a tabulating run for returning the parts fully to their normal positions. The lever |28 is provided with a heel |64 engageable with the upper part of the bracket |63 for limiting the return movement of the lever |28 and the connected parts to their normal positions under the urge of the springs I6I and 6B.

Means are provided for adjusting or varying the amount of'driving impulse generated by the power mechanism E. This variation or adjustment is effected by variably limiting the extent to which the actuator pawl nose I31ar enters a tooth interspace on the snatch roll under the urge ofthe spring |36 when the restraint of the trigger on the pawl |31 is discontinued. In the form shown, the actuator |26 is provided with a downwardly extending stop element or finger |65 which is disposed in front of and normally out of contact with a downwardly extending stop part, heel, or finger |66` onthe pawl |31. When the pawl |31 is rocked clockwise by the spring |39 so as to move the pawl nose |310, into a snatch roll tooth interspace, the pawl stop |66 moves toward the actuator stop |65, which may be so positioned as to be engaged by the stop |65 to arrest rocking of the pawl |31 before the tooth |31ar moves to the root of the snatch roll tooth interspace. By variably positioning one of the stops |65, |66, e. g., by bending the stop |65 towards or away from the stop |66, the extent to which the pawl tooth I31a enters the tooth interspace can be varied. Consequently, the angle through which the snatch roll rotates while in contact with the pawl, which determines the amount of driving of the pawl |31 and actuator |26 by the snatch roll |25, can be varied. Any suitable means or construction may be provided for adjusting one of the stops |65, |66 relatively to the other, but in the preferred construction the stop -I65 is formed integrally with the actuator |26 so as to be bendable toward or away from the stop |66.

In typewriters or like machines in which all or some of the instrumentalities to be operated, e. g., type bars, carriage return mechanism, tabulating mechanism, and escapement mechanism, are operated by power, it may be desirable to provide means for varying collectively the eX- tent of driving of the several actuator pawls corresponding to the pawl |31 and associated with the other mechanisms referred to. This may be accomplished by providing a knock olf bar |51 mounted on the main frame so as to extend under the front ends of all of the actuators corresponding to the actuator |26 shown in Figures l and 2. Any suitable means (not shown) may be provided for adjustably tilting or otherwise variably positioning the knock 01T bar |61 so that it will be engaged by the lower ends of the actuators to control the timing of disengagement of the associated actuator pawls from the snatch roll.

Operation In order that the cooperation of the various parts and sub-mechanisms may be clearly understood, a complete and typical operating cycle will be described. In the normal positions of therparts as shown in Figures l, 2, 3 and 6, the power driven mechanism E will be ineffective for transmitting power to the pull link |02, the escapement rack |3 will be in mesh with the escapement pinion |5 so that the carriage will be under the control of the escapement mechanism, the brake pinion 42 will be disengaged from the escapement rack I3 so that the carriage brake is disabled, and the tabulating device comprising the lever 65 and the ilipper blade 13 will be retracted so that the blade 13 will be out of the path of a projected stop D on the carriage. In order to eiect a tabulating run of the carriage, the tabulating key is depressed so as to rock the lever and cause the flipper |54 to depress the actuator |26 until the trigger |40 is rocked by the abutment |36 so as to release the actuator pawl |31 and permit it to be moved into engagement with the snatch roll |25 by the spring |30. The pawl |31 and the actuator |26 will then be moved momentarily forwardly to pull the link |02 and transmit drive through the cushioning connection |03 so as to rock the escapement rack lift lever 34 and the frame mounted tabulating lever 66 to the positions shown in Figure 5. Rocking of the lifting lever 34 will condition the carriage brake for operation and will disengage the escapement rack I3 from the escapement pinion I9 so as to permit the carriage to perform a tabulating run under the retarding action of the brake.

The rocking of the tabulating lever will move the iiipper blade 13 01T the shank portion 19 of the pin 80 so as to enable the spring 11 to move the blade 13 in front of the shoulder 86. The blade will then be in the position shown in Figure '7 in which both the blade and the tabulating lever 65 are latched in projected positions, with the blade 13 in the path of the stop D on the carriage.

Just before completion of the tabulating run the stop D will engage the cam face 96 on the rebound preventing pawl 81 so as to push the nose of the pawl rearwardly against the urge of the spring 9|, enabling the stop D to pass beyond the nose of the pawl 81 and to engage the Vgagement oftheblade "i3 with the pid Wi. 4Consequently `it is 4not necessary ior `the 'ilipperl blade `'13, .which .iis then ypushed. to the position :shownfin'gFigures 8 and 10, thus .preventing "further lettward movement of sthe fcarriage.

By'this itimelthe-spring 91 willihave .returned :the :rebound preventing `pawl 181 Ito the :position shown inFigures 7, 8. and IlOsso that thecam face 95 of the paWl will,thenlieadjacent the tapered `face `97 `of the stopDI .thespawll''l `thenbeing 4positioned Vto prevent `reboundingiof the icarlriage.

As soon r as the icarriage Chas `been :arrested 'by .movement of theipartsbtothe positions 'shown in fEiguresfS andf1'0,xwherein`the blade lhas moved ,oli the pinsshoulder'u', 'the normalizing spring lwwill ro'cl the .,tabulating lever-iixtoV its `re- :tracted position, thereby removingithe restraint o'fithe `blade 13 :on the carriage stop AD',A and substantially simultaneously rocking the lifting "leverf34to its normal `position so asto restore "the i carriage to the `control of the .escapement mechanism.

If the carriage should be cmovedtowardits `right end ,1 positionivvhen the tabulatinglever et is'in its operativeor Lprojected position Aand a stop'D' then `to the left of the tabulatinglever s55 is in its rset or `operative `position, *the taperedfacee'l s. on fthe `stop fD` `will `.engage a ta- `:pered cam face laon the blade d'3, `causing the stop D' to be moved to its inoperativeposition as .represented by `the showing i of` fthe` stops D. In this way` the carriage' will` be f permitted to conftinue Aits rightward movement Without damacfing '.thetparts.

`As previously ihas .been explained it :necessary for thelink f i liZ `tot actronly 4momentaiily on `the escapement r mechanism, the :brake s and the tabulating leverl''f, because .these lrnechanisms are latched in their operative positionsby enshoulder tabulating key fill 4to be held in depressed posi- -tion throughout a tabulatirig run.

"The mechanism disclosed for thepurpose of illustrating the f invention embodies the invention /in a1 preferredorm but it is `intended `that the disclosed mechanism'be vconsidered as iiiustrative rather than definitive `of the invention. The invention is` defined'in the appended claims.

i I claim:

i l. In a-typewritmer orli-ke machine, a `frame ileiement; a `carriage element; means mounting vvsaidcarriage elenieiitffor travelon said'irame element `in 'mutually opposite `directions; means for driving said carriage element in one of said directions; eecapeinenc mechanism for controlling xsaid Adriving ofl said carriage felement; a

."first.'stopdeilicezon.oneci` said elements; a sec- .cnd stop Adevice .fon .the other of 1 said 1 elements comprising rstmembei"` and Va second :member `fsecarate "from and 4mounted y.on i said s rstxmem- .fberztofinove relatively thereto; means `mounting said second stop device on said other oi said `elemeni'is "toimovewith its said first and second members moving concurrently from a retracted position which second member is disposed Aout ci line with said iirst stop device in the direction ci carriage travel andto a projected position in which said second member is disposed in line with said rst stop device in the direction of carriage travel; a latching part with respect `to which said vsecondstop device is ,movabie; `ineans operative upon -said-` second member when V.said second stopdeviceismoved to saidgprojectedposition for `moving said second member relatively to said first member and into latching engagement with saidlatching partthereby to hold said second stop deviceinxprojected position, said 4second memberbeingengageable with said rst stop .device Aat Va predetermined position -of said-carriage eiementduring itstravel` on said frame element `for movingsaidsecond member relatively to said first member and out of latching engagement With said latching part `-andfor bringing said carriageto rest; means for then returning `said second stop device to its retracted position with said first and second members moving concurrently; means for -disabling `said escapement mechanism `when said `second-stopdevice is moved to its projected p0- YSition and :re-enabling said escapement mechanism when said second stop device is returned `toits-retracted position; a lirst margin stop on i eaidf'rame element; aisecondmargin-stop on said carriage element cooperable with saidrst marstop independently of said i'irst and second `stop devices lfor limiting travel of` saidcarriage `element in said one ofsaid directions, one of `ssaidmargin stops being-movable by the other of -saidxnargin stops; andy connections between said oneof saidmargin stops and said second-member-of Asaid second stop -device for moving said second v,member out of engagement -fvvith `said latching ypartin `response to movement of 'said one oit-said niargintstops by saidother` of said margin stops. n

2. In-a typewriting or like machine, aframe element; `a carriage element; means 4mounting said carriage element fortravelonsaid frame `element in mutuallycoppositedirections; .means 4for drivingsaid carriage element in one `of -said directions; escapementmechanism for controlling saidI drivingfof said carriage element; a rst stop device on one of-said i elements; -asecond stop device onthe other ofsaid elements comprising a lever, fmeans-inounting-said `lever on said other of said elements to `rock about an raxisparallel to the direction of carriage travel, `and aiblade pivotally'mounted `on said lever to lrockaboutfan axis perpendicular to the lever axis, rocking of saidlever moving saidsecond stop device from a retractedpositiontin -Which `said blade-is-disposed out of line with-said first stop device in thedirection of carriage travel and to a projected position in Which said blade is disposed in line with said rst stop device'in the vdirection of 4carriage travel;a latching part with respecttovvhichsaid second stopdevice is'movable; `spring `means operative upon said blade -vvhen saidsecond stop device is moved to said projected position for moving said-blade relative- Vly to said lever and into `latchingengagement with said latching part thereby `to hold said second stop device in projected position, said latching part having a rstfportion normally engaged by `said blade when saidsecond stop device-is in retractedposition'and another porvice atapredetermined position of saidcarriage element during its travel on saidiframe element -ifor moving said blade relativelytosaid `lever and `out of -latching engagement with `said shoulder and for bringing said carriage to rest;

means for then returning said second stop device to its retracted position; and means for disabling said escapement mechanism when said second stop device is moved to its projected position and re-enabling said escapement mechanism when said second stop device is returned to its retracted position.

3. Typewriting or like machine mechanism as set forth in claim 2 including means for adjusting the position of said latching part relatively to the pivotal mounting of said lever.

4. Typewriting or like machine mechanism as set forth in claim 2 including means for adjusting said latching part both in the direction of carriage travel and perpendicularly to said direction.

5. In a typewriting or like machine, a frame; a carriage mounted on said frame for travel in typing spacing and return directions; means for driving said carriage in typing spacing direc'- tion; escapement mechanism for controlling said driving of said carriage; a tabular stop mounted on said carriage; a tabular stop lever pivotally mounted on said frame to rock about an axis parallel to the direction of carriage travel; a blade mounted on a side of said lever approached by said tabular stop during driving carriage travel in the typing spacing direction to rock about an axis perpendicular to the direction of carriage travel; normalizing means for holding said lever in a retracted position such that said blade is disposed out of the path of said tabular stop; actuating means for rocking said lever to a projected position such that said blade is disposed in the path of said tabular stop; a latch member mounted on said frame and extending alongside said blade on the side thereof approached by said tabular stop during carriage travel in the typing spacing direction and being formed with aV rst surface relatively near said lever, a sec'- ond surface relatively far from said lever, and a connecting shoulder; a spring urging said blade against said rst surface when said lever is in its retracted position and being operable upon movement of said lever to its projected position for rocking said blade against said second surface for engagement with said shoulder whereby said blade and said shoulder latch said lever against returning to retracted position, said spring being yieldable when said blade is engaged by the approaching tabular stop for permitting said blade to rock and be disengaged from said shoulder to enable said normalizing means to return said lever to its retracted position; and means for disabling said escapement mechanism when said lever is moved to projected position and for re-enabling said escapement mechanism when said lever is returned to retracted position.

6. Typewriting or like machine mechanism as set forth in claim 5 in which said latch member comprises a pin and in which the mounting for said pin comprises a part xed with respect to said frame and having an aperture through which said pin extends with radial clearance, whereby the position of said pin may be adjusted towards and away from said blade in the direction of carriage travel and towards and away from the path of said tabular stop perpendicularly to the direction of carriage travel, and means for holding said pin in adjusted position in said aperture.

7. Typewriting or like machine mechanism as set forth in claim 5 including a rebound preventing pawl mounted on said frame and being engageable with said tabular stop on the side thereof opposite that which engages said blade when said lever is in projected position; and a part on said blade engageable with said pawl for holding the latter in inoperative position when said lever is in retracted position.

8. Typewriting or like machine mechanism as set forth in claim 5 in which said normalizing means comprises a spring urging said tabular stop lever to its retracted position, and in which said actuating means comprises a power driven rotatable member, motion transmitting connections between said lever and said rotatable member including a coupler normally disengaged from said rotatable member but being movable into transient engagement therewith for momentarily coupling said rotatable member to said lever for rocking the latter to its projected position, and key mechanism for moving said coupler into such transient engagement with said rotatable member.

9. Typewriting or like machine mechanism as set forth in claim 5 in which said actuating means comprises a lever operating member connected to said stop lever, a key, and means responsive to depression of said key for imparting to said lever operating member a momentarily acting operating impulse.

10. Typewriting or like machine mechanism as set forth in claim 5 including a normally ineffective carriage brake; and means operable conjointly with movement of said stop lever to projected position and disabling of said escapement mechanism for rendering said brake eective during travel of said carriage in the typing spacing direction while unrestrained by said escapement mechanism.

11. Typewriting or like machine mechanism as set forth in claim 5 including a margin stop on said carriage; a center stop on said frame; a linger mounted for limited movement on said center stop and being disposed in the path of and being engageable by said margin stop when said carriage reaches a predetermined position in its typing spacing travel, whereby said finger is caused to have limited movement on said center stop; and means responsive to said movement of said finger for rocking said blade away from said second surface of said latch member toward said stop lever to disengage Said blade from said shoulder on said latch member whereby to enable said normalizing means to restore said stop lever to retracted position.

12. Typewriting or like machine mechanism as set forth in claim 5 in which said actuating means comprises an operating member, a yieldable cushioning drive transmitting connection between said operating member and said stop lever, a key, and means responsive to depression of said key for imparting an operating stroke to said operating member.

WILLIAM H. KUPPER.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS 0 Number Name Date 1,066,657 Roberts July 8, 1913 1,772,768 Bache et al. Aug. 12, 1930 2,182,433 Hart Dec. 5, 1939 2,303,878 Helmond Dec. 1, 1942

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